Illumination and detection system for microfiche identification

Details Illumination and detection system for microfiche identification Illumination and detection system for microfiche identification

1976-05-26

1977-11-15

Smith, Alfred E.

Radiant energy

Photocells; circuits and apparatus

Optical or pre-photocell system

250567, 2091117R, G02F 101, H01J 3912

Patent

active

040587231

ABSTRACT:
In order to detect the identification marks on an exposed transparent card in a stack of similar cards, the identification marks on the exposed card are illuminated by polarized light that is incident at an angle greater than the polarizing angle of the transparent material of the cards. The high angle of incidence and the polarization of the incident light reduce the transmission of light through the exposed card, and thereby reduce the illumination and probability of detection of identification marks on a card adjacent the exposed card.

REFERENCES:
patent: 2726173 (1955-12-01), Martin
patent: 2947212 (1960-08-01), Woods
patent: 3812374 (1974-05-01), Tuhro
patent: 3899687 (1975-08-01), Jones
patent: 3986612 (1976-10-01), Kamm et al.

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